Fan Coil Unit Refurbishment

JW Marriott Atlanta Buckhead

True luxury is found at the JW Marriott Buckhead in the heart of this business, shopping and entertainment district. All 367 spacious PURE allergy friendly guestrooms have city views of downtown Buckhead.

Challenges: The guest rooms were not cooling and heating correctly. Airflow was insufficient to cool the room properly. The temperature set point was not reached consistently. Odor was coming from the units due to improper cooling creating humidity and mildew and dirty units and degraded insulation trapping odor.

Coil temperature averaged 53.61℉.

Supply temperature averaged 56.05℉.

Average airflow was 749 FPM.

Solutions: The project’s goal was to bring the units back to efficient operation and as-designed operational performance by increasing airflow, lowering supply and coil temperature.

The solutions included:

Refurbish the units including rejuvenating the coils to increase airflow and enhance heat transfer.

Disinfect and deodorize the units to remove odors; and

Replace fiber insulation with anti-microbial fiber-free foam insulation to reduce sound and odor and remove fiber floating around the unit.

Results

Coil temperature dropped by 7% from an average of 54℉ to 50℉; coil temperatures were below 53 ℉.

The graph below displays before and after FPM airflow on high fan setting. The red line from left to right demonstrates the airflow before service from low to high ranged from 290 FPM to 1050 FPM. The blue line demonstrates the airflow after service within the manufacturer’s design target. The horizontal axis represents the room numbers.

Before & After Supply Temperature Data

The graph below displays before and after supply temperature. The red line from left to right demonstrates the supply temperature before service from high to low ranged from 69 degrees to 51 degrees averaging 56 degrees. The blue line demonstrates the supply temperature after service averaging 52 degrees. The horizontal axis represents the room numbers.